[OE-core][wrynose][PATCH] python3-pip: Fix CVE-2026-8643

["Hetvi Thakar -X (hthakar - E INFOCHIPS PRIVATE LIMITED at Cisco)" <hthakar@cisco.com>]

From: Hetvi Thakar <hthakar@cisco.com>

This patch backports the upstream fix for CVE-2026-8643. The
commit is included in pip 26.1.2 and referenced in [1]. The public
CVE advisory is referenced in [2].

The selected commit is self-contained. Later upstream commits refactor
the validation to use a shared containment helper and update release
notes; they are not prerequisites for this fix.

[1] https://github.com/pypa/pip/commit/8eb178480bd1a2b223f509fc430796b265158dfb
[2] https://github.com/advisories/GHSA-wf93-45jw-7689

Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
---
 .../python/python3-pip/CVE-2026-8643.patch    | 80 +++++++++++++++++++
 .../python/python3-pip_26.0.1.bb              |  4 +-
 2 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-devtools/python/python3-pip/CVE-2026-8643.patch

diff --git a/meta/recipes-devtools/python/python3-pip/CVE-2026-8643.patch b/meta/recipes-devtools/python/python3-pip/CVE-2026-8643.patch
new file mode 100644
index 0000000000..2f38ad0207
--- /dev/null
+++ b/meta/recipes-devtools/python/python3-pip/CVE-2026-8643.patch
@@ -0,0 +1,80 @@
+From 483d83c13c9d69c1916c06cab29991f6c2725cee Mon Sep 17 00:00:00 2001
+From: Damian Shaw <damian.peter.shaw@gmail.com>
+Date: Wed, 20 May 2026 15:20:25 -0400
+Subject: [PATCH] Reject entry point names that escape scripts dir (#14000)
+
+* Reject entry point names that escape scripts dir
+
+* NEWS ENTRY
+
+CVE: CVE-2026-8643
+Upstream-Status: Backport [https://github.com/pypa/pip/commit/8eb178480bd1a2b223f509fc430796b265158dfb]
+
+Backport Changes:
+- Omitted tests/unit/test_wheel.py because the pip 26.0.1 PyPI sdist
+  does not ship the upstream test suite and the OE recipe does not
+  enable ptest.
+
+(cherry picked from commit 8eb178480bd1a2b223f509fc430796b265158dfb)
+Signed-off-by: Hetvi Thakar <hthakar@cisco.com>
+---
+ news/14000.bugfix.rst                         |  2 ++
+ src/pip/_internal/operations/install/wheel.py | 26 ++++++++++++++++---
+ 2 files changed, 25 insertions(+), 3 deletions(-)
+ create mode 100644 news/14000.bugfix.rst
+
+diff --git a/news/14000.bugfix.rst b/news/14000.bugfix.rst
+new file mode 100644
+index 000000000..3b86f1b3b
+--- /dev/null
++++ b/news/14000.bugfix.rst
+@@ -0,0 +1,2 @@
++Reject ``console_scripts`` and ``gui_scripts`` entry points whose name would
++install a script outside the scripts directory.
+diff --git a/src/pip/_internal/operations/install/wheel.py b/src/pip/_internal/operations/install/wheel.py
+index 40097d6a7..231e40065 100644
+--- a/src/pip/_internal/operations/install/wheel.py
++++ b/src/pip/_internal/operations/install/wheel.py
+@@ -397,11 +397,31 @@ class MissingCallableSuffix(InstallationError):
+         )
+ 
+ 
+-def _raise_for_invalid_entrypoint(specification: str) -> None:
++def _script_within_dir(name: str, scripts_dir: str) -> bool:
++    """Return whether script ``name`` resolves to a path inside the ``scripts_dir``.
++
++    distlib joins the entry point name onto the scripts directory, so a name
++    with path separators or ``..`` components can resolve elsewhere.
++    """
++    root = os.path.normpath(scripts_dir)
++    dest = os.path.normpath(os.path.join(scripts_dir, name))
++    return dest.startswith(root + os.sep)
++
++
++def _raise_for_invalid_entrypoint(specification: str, scripts_dir: str) -> None:
+     entry = get_export_entry(specification)
+-    if entry is not None and entry.suffix is None:
++    if entry is None:
++        return
++
++    if entry.suffix is None:
+         raise MissingCallableSuffix(str(entry))
+ 
++    if not _script_within_dir(entry.name, scripts_dir):
++        raise InstallationError(
++            f"Invalid script entry point name {entry.name!r}: the script "
++            f"would be installed outside the scripts directory ({scripts_dir})."
++        )
++
+ 
+ class PipScriptMaker(ScriptMaker):
+     # Override distlib's default script template with one that
+@@ -419,7 +439,7 @@ class PipScriptMaker(ScriptMaker):
+     def make(
+         self, specification: str, options: dict[str, Any] | None = None
+     ) -> list[str]:
+-        _raise_for_invalid_entrypoint(specification)
++        _raise_for_invalid_entrypoint(specification, self.target_dir)
+         return super().make(specification, options)
+ 
+ 
diff --git a/meta/recipes-devtools/python/python3-pip_26.0.1.bb b/meta/recipes-devtools/python/python3-pip_26.0.1.bb
index 28af8f7ec7..3bea989958 100644
--- a/meta/recipes-devtools/python/python3-pip_26.0.1.bb
+++ b/meta/recipes-devtools/python/python3-pip_26.0.1.bb
@@ -24,7 +24,9 @@ LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=63ec52baf95163b597008bb46db68030 \
 
 inherit pypi python_setuptools_build_meta
 
-SRC_URI += "file://no_shebang_mangling.patch"
+SRC_URI += "file://no_shebang_mangling.patch \
+            file://CVE-2026-8643.patch \
+           "
 
 SRC_URI[sha256sum] = "c4037d8a277c89b320abe636d59f91e6d0922d08a05b60e85e53b296613346d8"
 
-- 
2.35.6